EDF Energy said Friday it will increase its standard variable gas and electricity prices for residential U.K. customers by 10.8% from Dec. 7, the sharpest rise among the five major suppliers that have already announced price increases.

But EDF Energy, the U.K. unit of French power company Electricite de France SA (EDF.FR), said that "for typical customers the company's new standard variable prices will however still be lower than those of all the major suppliers which have announced standard price rises this autumn."

"The company acknowledged the price rise would be unwelcome but said that the combination of significant extra costs in the use of gas and electricity networks, mandatory energy efficiency and social schemes, plus the rising price of wholesale energy meant it could no longer put off a price change," the company said in a statement.

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